Linux開啟Lockdep檢測核心死結__Linux

Lockdep是核心檢測deadlock的手段，預設沒有開啟，需要make menuconfig增加配置開啟，在Hacking Kernel選項下面Y選擇如下配置

 1. [*] Detect Hard and Soft Lockups 2. [*] Detect Hung Tasks 3. [*] RT Mutex debugging, deadlock detection 4. -*- Spinlock and rw-lock debugging: basic checks 5. -*- Mutex debugging: basic checks 6. -*- Lock debugging: detect incorrect freeing of live locks 7. [*] Lock debugging: prove locking correctness 8. [*] Lock usage statistics

儲存配置編譯安裝核心，重啟後proc下產生如下檔案說明lockdep開啟了。

/proc/lockdep/proc/lockdep_chains/proc/lockdep_stat/proc/locks/proc/lock_stats

運行系統如果出現死結，dmesg會給出提示資訊。

參考：https://stackoverflow.com/questions/20892822/how-to-use-lockdep-feature-in-linux-kernel-for-deadlock-detection